Preheat the oven to 400°F. Line a baking sheet with foil, and set the flatbread on the pan. Bake for 2 minutes.
Remove from the oven and spread on the ranch dressing and top with mozzarella, bacon and tomatoes. Bake for 10 to 13 minutes, or until the cheese is nice and bubbly.
Top with red pepper flakes, arugula and avocado. Slice and enjoy while hot!